The Nervous System

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Explian the difference between the Central Nervous System and the Peripheral Nervous System.

The CNS is the brain and the spinal cord. The PNS is all of the other parts of the nervous system

describe a neuron.

A neuron is a cell with a body and a nucleus. Also a neuron has dendrites that receive signals from other neurons and axons that send signals to other neurons.

What is a nerve?

A nerve is a collection of nerve fibers, or axons, bundled together with blood vessels through which impulses travel between the CNS and other parts of the body.

What is the function of the PNS?

The PNS connects your body to the CNS

Controls voluntary movements

Keeps bodies functions in balance.

Explain why the medulla is important.

it is very important because it controls breathing heart rate, blood pressure etc.

Describe the path of an impulse from the skin to the brain and the path of the response.

when someone touches your skin, an impulse travels along a sensory neuron spinal cord and then to your brain. The response travels back through the spinal cord then through a motor neuron and into a muscle.

What is a neuron?

A neuron is a nerve cell that is specialized to receive and conduct electrical impulses.

How hast and how slow can impulses travel?

Impulses can travel as fast as 150m/s

or as slow as 0.2m/s.

What is a sensory neuron?

A sensory neuron is a neuron that gathers information about what is going on around you.

What is a motor neuron

neurons that send impulses from the brain

What does the left hemisphere of the brain primarily control?

Speaking

Reading

Writing

problem solving

What does the right side of the brian primarily control?

Spatial thinking

processing music

interpreting emotions

What is the somatic nervous system?

The somatic nervous system has mostly somatic neurons that are under your control. These neurons stimulate skeletal muscles. They control voluntary movements such as writing, smiling, talking or jumping.

What is the autonomic nervous system?

It controls body functions that you don't think about.

What is the sympathetic nervous system?

The sympathetic nervous system speed up the involuntary body functions

What are five effects of the sympathetic nervous system?

1. Pupils dilate ( grow larger to make it easier to see objects)

2. Heart rate increases (increases blood flow)

3. Bronchioles dilate (grow larger to increase up take of oxygen)

4. Blood vessels dilate (grow larger to increase circulation)

5. Digestion slows (reduces blood flow to the stomach and intestines)

What is the parasympathetic nervous system?

The parasympathetic nervous system slows down the involuntary body functions